A 10° differential is good. LL at 180° and HL at 200° is fine. On a Honeywell aquastat, always keep at least 20° between the LL and HL to prevent circulator lockout. On Hydrolevels you can set them 10° apart, but I'd just stick with 20° apart for safety.
You could lower your LL to save a little coal during normal weather and raise up to 180° during those polar vortex events.
Looking for help with efm 520 timer not turning on boiler.
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Walt Drake
- New Member
- Posts: 10
- Joined: Sat. Sep. 23, 2023 4:36 pm
- Stoker Coal Boiler: Efm 520
- Coal Size/Type: Rice
Thank you again for all your help I really appreciate it, take care.
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nepacoal
- Member
- Posts: 1642
- Joined: Wed. Nov. 21, 2012 7:49 am
- Location: Coal Country
- Stoker Coal Boiler: Keystoker KAA-4 / "Kelly" and an EFM 520 at my in-laws
- Hand Fed Coal Boiler: Harman SF-260 - retired
- Coal Size/Type: Buck
Good luck! Hopefully you'll have another 15 years of trouble free service...
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davidmcbeth3
- Member
- Posts: 8515
- Joined: Sun. Jun. 14, 2009 2:31 pm
- Coal Size/Type: nut/pea/anthra
100% surer my advice was totally worthless on this one.
